/**
 * Package-owned invariant companion for `@deepseek-ai/dsh-session-projection-cache`.
 * @module @deepseek-ai/dsh-session-projection-cache/invariant
 */

/* jscpd:ignore-start */
import type { Context } from '@deepseek-ai/cordis'
import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'

const PACKAGE_NAME = '@deepseek-ai/dsh-session-projection-cache'

/** Cordis companion plugin name. */
export const name = 'session-projection-cache-invariant'
/** Service required before the companion can reserve package ownership. */
export const inject = ['invariants']

/**
 * No runtime invariant: the cache's correctness relation (a stored row equals
 * the registry fold at its `seq` watermark) is only checkable by re-running the
 * fold over the persisted log — duplicating the implementation rather than
 * detecting drift — and its staleness is by design (fail-soft writes). The
 * durable boundary is already schema-validated by the storage-domain layer
 * on every reopen, and the read ladder's version/watermark guards are proven
 * by the package spec.
 */
const install: InvariantInstaller = () => {}

/**
 * Register this package's invariant companion.
 * @param ctx - Cordis context carrying the invariant service.
 * @returns the installed registration's disposer after setup succeeds.
 */
export const apply = (ctx: Context): Promise<() => void> =>
  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
/* jscpd:ignore-end */